In the world of mechanical power transmission, gear drives employ a special and 
prominent place. This is actually the most preferred technology when you need to transmit significant power over a brief distance with a continuous velocity ratio. The mechanism of gear drives is fairly simple – one’s teeth, which are cut on the blanks of the apparatus wheel, mesh with one another to transmit power. To avoid slipping, the projections on one disc mesh with the recesses on various other disc in equipment drives.
This technology uses different types of gears for power transmission. In fact, it can transmit power not merely gear chain china between parallel shafts, but also between non-parallel, co-planar, and intersecting etc. shafts.